2011 年 10 巻 2 号 p. 141-148
The aim of our project is to develop a design method that integrates expert knowledge with user-side kansei. In this study, as an example of a designed product, we extract design rules for the grip of a stamp. First, an experiment is conducted to obtain data for the usability and accurateness of sealing. Secondly, design rules on the grip shape of the stamp are extracted from this dataset by decision tree analysis. The results show that  the shape of the stamp grip affects stamping performance and leads to systematic bias,  especially in right-handed people, who tend make a stamp seal with a shift toward the upper right direction, along with a clockwise rotation and a blurring of the right side of the stamp mark, and  the key design areas of a stamp are the contact face of the thumb and the thickness of the bottom.